I have exma and sensitive skin. However it's worth pointing out that just because a lot of dyspraxic people have skin problems does not mean there is correlation, let alone cause. Skin problems such as exma and acne are all extremely common in the general population. There isn't really anything about dyspraxia that would suggest it causes skin problems, so it makes sense to assume that dyspraxic people will be representetive of the population.

In addition, most people who reply to a thread like this will be people with skin conditions, simply because the topic will be more of interest to that group.